As a coincidence I obtained a mini PCI 802.11a/b/g wireless adapter based on a Broadcom chipset. The WL-600 (if the thingy is available anywhere) has support for the Atheros (shit), but no explicit support for the Broadcom BCM4309. I replaced the 802.11b/g adapter with the 802.11a/b/g adaptor. The Wl500g booted normally, however it stayed on the same (11b/g) channel. I issued the following commands:
wl down //disable wifi
wl band a //switch to band a
wl txpwr 50
wl up
wl csa master now 52 //switch to channel 52
wl antdiv 3 //enable antenna RX diversity
wl txant 3
The following picture shows the WL500g wth the 802.11a card:
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